Safety device for presses



Nov. 9 1926.. 1,606,222

R. E. HlLL SAFETY DEVICE FOR PRESSES Filed Dec. 11. 1924 z sheets-sheet 1 A Nov. 9 1926.

kfw f www Patented Nov. 9, 1926.

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TION, OF

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This inventan is' 1 Stray Cie-vige; for: presses' tojprevent injury'lto v'the handsYi off thel operator; It? frequently happens? that" the operatorisf'noti swift eno'llgfi3 infw'ithf e drawing his' ingers 'frein beneath the press head and in thatevent:` thepress 'headf in descending Will injure the' yfingers.

The objee'tf of inventionl therefore" is to instantly arrest'th'e plunger'andpre'ss'f :t hea-cli the: momenti the press-fheau-Lcornes in connecting -With' the plungera` pavvlr which is actuated Vby, the vertical movemen't'f of the* pressv head I and,` inicomb'in'ation'"'Witl'iv this which the 'plunger Works `which-"rateh`et-'is so positioned 'that'during,the'A normal opera-"- tion ofv theplunger and pr'ess head it Will travel'entirely past' the teeth of the'ratc'heti and when the press Yhe'ajdcomesf in"'contaotf be the case if thehngersof'the operatorY were in the Way', thenf the pa-Wlfwill engage?v the' ratchetf Tan'df immediately *l arrest' the pressheadi- The invention consists also in certain details of construction and novelties of combination2 all of which will be more fully described hereinafter and set forth in the appended claims.

In the drawings forming a part of this specification, Fig. 1 is a side View of a press to which my invention is applied, the mechanism for actuating the plunger being omitted; Fig. 2 is a face view of that portion of the d `vice to which my invention is applied; 3 is an enlarged detail sectional View taken through the plunger and press head, certain parts being shown in elevation; Fig. 4; is a horizontal sectional View on the line 4 4 of F ig. 3; and Fig. 5 is a sectional View on the line 5 5 of Fig. 3.

In carrying out my invention I employ a guiding standard 10 in which Works the limited amount of' vertical Ir'io'venentfWithl-r reference" to tleierid7A of the!plungerand'fthenfV pawllcarriedfby 'the plunger-y I provide* af ratchet upon the guiding stan'd'a'rd'thijuglrV downward movement of the plungrwa'n'd" the exterior ofthe loweriend ofthe piange; 75 It )vill be understood therefore: that? the press li'e'a'df 12'isi hel.dfagtiinst ilo'taftion With reference to the plunger"` butj has a Yvertieal, movementliinitedby the sizef of the rece'ss, orfnotc'hf 12" andthel positionifofflthe setscrevvv 5G '.betWeen the lower end of they trippin llandf' fthe adjustable st' upwardly projecting to'j 'psitioni this* oeil "spr'ingm" andai'elspringrrfre to"stte'lf bore 11c extending upwardly'from and communicating With the chamber 11a in the lower end of the plunger, this bore 11 being of suoli dimensions as to permit the Vertical movement of the tripping stud and coil `spring and stem. Projecting horizontally outwardly from the'tripping stud 16 is a iinger 18 Working in a horizontal opening 11d x produced in the front side of the plunger and Communicating with the bore 11, This horizontally projecting nger 18 is adapted to engage an inwardly extending horizontal finger 19 which is. connected at its outer end to the shaft 20 journaled in a suitable bearing 21 secured to the face of the plunger and to the end of this shaft 21 isattaohed the pawl 22 which is adapted to be'brought into engagement with the teeth of the ratchet 23 Which is fastened to the front face of the standard in alignment with pawl 22 and near the lower end of said standard. This pawl 23 is of such length and is so positioned with reference to the pawl 22 that duringthe normal operation or' the plunger and press head, that is, when the press head is not moved upwardly until it comes in contact with the work in the die, the pawl will travel entirely beyond the ratchet. When, however, the press head is caused to move upwardly before its proper time, as for instance by ruiming in contact with the linger or' the operator then this upward movement of the press head will cause the tripping stud 16 to move upwardlycarrying with it the tinger 18 which in turn operates the linger 19, rocks the shait 2O and throws the pawl 22 into engagement with the ratchet 23 and immediately checks the'downward movement olz the plunger thereby preventing the crushing oi'the lingers of the operator. By having the fingers 18 and 19 of considerable length and positioning the pawl so that during the normal operation ot' the press it will just barely escape the ratchet, it is obvious that a very slight movement of the press head will be sucient to instantly throw the pawl into engagement with the ratchet and stop the device.

Having thus described my invention, what I claim is l. The combination with a standard, of a plunger movable in the standard and carrying a press head at its lower end, said press head having a limited amount or" vertical movement with reference to the plunger, a ratchet arranged upon the face of the standard, a pawl pivotally carried by said plunger and means interposed between the press head and pawl for actuating said pawl when the press head is moved toward the end or' the plunger.

2. rIhe combination with a standard, of a plunger sliding therein and carrying a press head at its lower end said press head having a limited vertical movement with reference to the end ol the plunger, a ratchet arranged upon the lace of the standard near its lower end, a pawl carried by the plunger land normally moving past the ratchet, an

- enO'aO'e the ratchet.

3. The combination with a plunger having a press head at the end thereof, of a pawl carried by said plunger, a standard having a ratchet on the face thereof, adjacent the pawl, a linger carried by the pawl, and an actuating linger engaging the pa'wl linger, said actuating linger ,being operatively connected with the press head, said press head having a limited amount otvertical movement relative to the plunger.

1. The combination with a standard pr vided with a ratchet, of a plunger provided with a press head., of means for holding said head against rotation, means for limiting the vertical movement oi the presshead relative to the plunger, a tripping stud connected with the press head, an actuating linger carried by said stud, a/pawl pivoted to the tace of the plunger and having a linger engaging the actuating linger whereby upon movement of the pressrhead theA pawl will Vbe 4thrown toward the ratchet.

5. The combinationy with a standard having a ratchet, of a plunger working in said standard and carrying a pawl upon its outer face, and a vertically movable press head at its lower end, means for connecting said press head to theA plunger and holding the same against rotation but permitting vertical movement, a tripping stud having an actuating linger, a linger carried by the pawl and engaging said actuating linger, and yieldable connecting means between the tripping studV and press head.

In testimony whereof, I hereunto aliizr my signature l ROLAND n. nrt-L. 

